diff --git a/Makefile b/Makefile
index d7fbc475e..9a6ff156c 100644
--- a/Makefile
+++ b/Makefile
@@ -931,5 +931,6 @@ print-version:
 	@echo $(BR2_VERSION_FULL)
 
 include docs/manual/manual.mk
+-include $(BR2_EXTERNAL)/docs/*/*.mk
 
 .PHONY: $(noconfig_targets)